Make UIViewController a singleton?

Question

During the use of my app, the user should be able to start, stop, forward background music. (Across several UIViewControllers). For this, I made my MusicPlayer a singleton (NSObject). If I create the controls in every view for itself it works, but what I want is basically one view which handles the music player class and is present all the time. The user also should be able to "hide" and "show" the view by swiping it to the left or to the right. So if it is hidden and I change my view Controller it should be hidden in the new view Controller too and the music should not be interrupted.

I tried this one in my home view controller and it works:

UIView * playerView = [[UIView alloc] initWithFrame:CGRectMake(0, 300, self.view.bounds.size.width, 44)];
playerView.backgroundColor = [UIColor redColor];

[[[[UIApplication sharedApplication] delegate] window] addSubview:playerView];

Is there a way to do this in the ApplicationDelegate?

Brian · Accepted Answer · 2012-03-23T16:24:15.030

7

If your singleton MusicPlayer is playing the music, then it should not be interrupted when the view changes. And instead of creating music controls for every view controller, you could add the music controls view as a subview of the window and make sure that it stays on top of everything else.

Update: In your application delegate, you typically have some code to set up the main view (i.e. the applicationDidFinishLaunching method). I assume that you have a primary navigation or tab controller in which you do everything else. So after adding its view to the window, create and add your music player controller view and add it as a subview of the window. It will remain on top as long as you don't add other views to the window (if you do, you just need to move the music controls back to the top).

I would use a singleton MusicPlayerController view controller which owns the music player controls view. That way, other view controllers can easily show or hide the controls.

edited Mar 23 '12 at 16:24

answered Mar 23 '12 at 15:50

Brian

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Music does not get interrupted. This part works! Could you edit your answer and go more in detail considering the second part of your answer? Thanks so far! – DAS Mar 23 '12 at 15:52
How can I get the view stay on top of everything else? It is not visible? Question updated. – DAS Mar 23 '12 at 15:59
Thanks, sounds good to try. But how can I add a view to a singleton class or create a singleton ViewController? – DAS Mar 26 '12 at 06:35
Google "iphone singleton class" - you should find all the information you need :-) – Brian Mar 26 '12 at 14:09

score 0 · Answer 2 · edited May 23 '17 at 12:28

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You can't : How to add button to UINavigationController

"Add UIbarButtonItem on the UIViewController not not on the UINavigationController. The navigation controller displays the navigation item of the top viewVontroller, not itself."

edited May 23 '17 at 12:28

Community

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answered Mar 05 '14 at 00:11

Damien Romito

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score 0 · Answer 3 · answered Mar 23 '12 at 15:55

If you use a container view controller (e.g. UINavigationController), you then have all the view controllers switching between one another, and on top of the container you can add your MusicPlayer controls (easiest way would be for it to have the same parent as the navigation controller), that way it's created only once and it doesn't depend on what views are displayed under it.

Make UIViewController a singleton?

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